chrome/browser/chromeos/device_hierarchy_observer.h

   1 // Copyright (c) 2012 The Chromium Authors. All rights reserved.
   2 // Use of this source code is governed by a BSD-style license that can be
   3 // found in the LICENSE file.
   4
   5 #ifndef CHROME_BROWSER_CHROMEOS_DEVICE_HIERARCHY_OBSERVER_H_
   6 #define CHROME_BROWSER_CHROMEOS_DEVICE_HIERARCHY_OBSERVER_H_
   7
   8 namespace chromeos {
   9
  10 // Observers receive notifications when a device has been added/removed.
  11 class DeviceHierarchyObserver {
  12  public:
  13   virtual void DeviceHierarchyChanged() = 0;
  14
  15   // Called when a new device (e.g. an external USB keyboard) is attached or
  16   // detached.
  17   virtual void DeviceAdded(int device_id) = 0;
  18   virtual void DeviceRemoved(int device_id) = 0;
  19
  20   // Called when a key on either a built-in keyboard or an external one is
  21   // pressed.  |device_id| is the source of the key event which will be sent to
  22   // the Chrome window shortly.
  23   virtual void DeviceKeyPressedOrReleased(int device_id) = 0;
  24
  25  protected:
  26   virtual ~DeviceHierarchyObserver() {}
  27 };
  28
  29 }  // namespace chromeos
  30
  31 #endif  // CHROME_BROWSER_CHROMEOS_DEVICE_HIERARCHY_OBSERVER_H_